I bought a CO2 meter for work, with the intention of taking it into (small) conference rooms once in a while to see what happened to the CO2 there. What I foun

I bought a CO2 meter for work, with the intention of taking it into (small) conference rooms once in a while to see what happened to the CO2 there. What I found surprised but pleased me: The CO2 levels at my desk are quite low, spike at night when HVAC is off (when the building is empty), but generally during daytime are about the same as being at home with windows open in a suburban area. Granted, it's been more than a year since I've sat at my desk... But still, it was nice to know.